DE102019216240A1 - Method and device for producing a non-grain-oriented electrical steel - Google Patents

Abstract

The invention relates to a method for producing a non-grain-oriented electrical strip, comprising the steps: casting (V20) a strip material (6) from a melt (5) by means of a continuous strip casting process; Hot rolling (V30, V40) of the strip material (6) at starting temperatures of the strip material (6) greater than 950 ° C., a hot-rolled strip material (6 ") with a thickness of less than 0.8 mm being produced; winding (V50) of the hot-rolled strip material (6 ") to form a coil (17), the reeling taking place at a winding temperature of the hot-rolled strip material (6") greater than 900 ° C, in particular greater than 1000 ° C; and cooling (V60) of the hot-rolled and reeled strip material ( 6 '' ') to the non-grain-oriented electrical steel (25). The invention also relates to a device for carrying out the method.

Description

The present invention relates to a method and an apparatus for producing a non-grain-oriented electrical steel.

Electrical steel, which can also be referred to as electrical steel, has a high magnetic permeability due to the special alloy composition and is therefore preferably used as a magnetic core material in electrical machines, in particular in electrical motors. In order to minimize magnetic losses, electrical steel with as isotropic properties as possible is used in applications in which the magnetic flux is not fixed in any particular direction and therefore equally good magnetic properties are required in all directions of the material. Such electrical steel is referred to as non-grain-oriented electrical steel. In the case of non-grain-oriented electrical steel, the crystallites are randomly aligned in the plane of the sheet. The development of a sufficient isotropy of the magnetic properties of non-grain-oriented electrical steel is significantly influenced by the design of the alloy design and the manufacturing process.

From the WO 2018/019602 A1 a method for producing a non-grain-oriented electrical steel sheet is known. Here, a steel melt with aluminum and silicon in addition to other alloy elements is produced and a pre-strip is cast using a strip casting process. The pre-strip is then hot-rolled, the pre-strip either being reheated to 1000 ° C to 1100 ° C or being hot-rolled directly from the casting heat without reheating. The hot strip produced in this way is then coiled at a temperature of less than 850 ° C. The hot strip is also subjected to single or multi-stage finish rolling at a temperature of 350 ° C to 570 ° C. Finally, the finish-rolled steel strip is annealed at 900 ° C to 1080 ° C for a period of 10 to 60 seconds and then cooled in the air.

From the U.S. 5,102,478 A a method for producing a non-grain-oriented electrical steel sheet is known. A steel melt with the main alloy element silicon is produced and a strip material is produced from this via a continuous casting process. The strip material is then rolled in a hot rolling process, the starting temperature being above 1000 ° C. It is optionally provided that at surface temperatures of less than 600 ° C, reheating to over 1000 ° C takes place before hot rolling and the temperature is maintained for more than 10 minutes. The hot rolling process is completed at temperatures between 850 ° C and 750 ° C. The tape produced in this way is then wound up at temperatures below 650 ° C. The hot strip is then annealed before it is cold-rolled in one or more steps. Finally, the steel strip is continuously annealed at temperatures between 800 ° C and 1050 ° C.

The above-mentioned methods have the disadvantage that a final annealing after the coiling is necessary to adjust the isotropic or the non-grain-oriented properties of the electrical steel sheet, with the material having to be heated from a cold state to over 800 or 900 ° C. This process is energy-intensive and significantly extends the process time. Overall, the processes mentioned have a low level of process reliability, since the process steps are carried out in the metastable area of the material.

The present invention is based on the object of providing a method for producing a non-grain-oriented electrical steel strip which has high process reliability at lower process costs. The object is also to provide a device for producing a non-grain-oriented strip material which enables a corresponding production process with low process costs and high process reliability.

The object is achieved by a method for producing a non-grain-oriented electrical steel strip, comprising the steps: casting a strip material from a melt by means of a continuous strip casting process; Hot rolling the strip material at starting temperatures of the strip material greater than 950 ° C., a hot-rolled strip material with a thickness of less than 0.8 mm being produced; Winding the hot-rolled strip material into a coil, the winding taking place at a winding temperature of the strip material greater than 900 ° C., in particular greater than 1000 ° C.; and cooling the hot-rolled and coiled strip material into the non-oriented electrical strip.

One advantage of the method is that non-grain-oriented electrical steel can be produced particularly efficiently due to the relatively high rolling temperature and coiling temperature. Due to the temperature control of the process, the desired magnetic material properties of a non-grain-oriented electrical steel are available immediately after the hot-rolled and reeled strip material has cooled. After cooling, the hot-rolled and coiled strip material can thus be used directly as non-grain-oriented electrical strip without further cold rolling and / or without additional heat supply. So is it is possible for the hot-rolled, reeled and cooled strip material to be fed to a contouring process in which electrical steel sheets are cut out of the electrical steel strip. Between the final pass and the contouring process, in particular between the cooling and the contouring process, no further rolling and / or annealing therefore has to take place in order to produce electrical steel sheets with the non-grain-oriented material properties.

The melt that is used for continuous strip casting can be a steel melt that comprises the following alloy elements in percent by mass: 0.001% <C ≤ 0.06%, at least one of the elements Si <7.5% and Al <4%, optional an alloy additive with at least one alloy element from the group of in particular Mn, P, Sn, Sb, Ti, Nb, V, N and B, or similar, with a total of up to a maximum of 2.135% and the remainder iron and inevitable impurities. The melt can in particular comprise silicon with a mass fraction of 2.0% to 7.5% and / or aluminum with a mass fraction of 0.1% to 4%. The alloy additive can contain at least one of the elements manganese with a maximum proportion of 1.5%, phosphorus with a maximum proportion of 0.1%, tin with a maximum proportion of 0.2%, antimony with a maximum proportion of 0.2%, titanium with a Maximum proportion of 0.01%, niobium with a maximum proportion of 0.05%, vanadium with a maximum proportion of 0.05%, nitrogen with a maximum proportion of 0.015%, and boron with a maximum proportion of 0.01%, the given mass fractions refer to the entire melt. The specific composition of the melt and in particular of the alloy additive can be selected on the basis of the application-specific requirements for the electrical steel. The melt is melted to temperatures above the alloy-dependent liquidus temperature, with an overheating temperature being set system-specifically depending on the furnace.

For casting the strip material from the melt, the known methods for continuous strip casting, in particular horizontal and vertical strip casting, can be used. The strip material emerging from a strip casting plant can have an outlet temperature of greater than or equal to 1200 ° C. directly behind the casting gap. In particular, systems that work according to the two-roller process can be used as the strip casting system. It is also conceivable that the continuous strip casting is designed as a profile casting process, so that the strip material has a variable thickness profile over the width. As a result of the continuous strip casting process, the strip material can be cast with a casting thickness of a maximum of 2.5 mm, in particular of a maximum of 1.5 mm, measured directly behind the casting gap. The degree of rolling in the subsequent hot rolling process step can be reduced by low casting thicknesses of the strip material after the strip casting process. In the case of lower degrees of rolling, either the number of necessary rolling passes can be reduced and / or the necessary rolling force can be reduced, which in each case leads to an increase in process reliability.

By hot rolling the strip material at starting temperatures of the strip material greater than 950 ° C, rapid recrystallization is achieved during the forming process, which is also referred to as more dynamic recrystallization. The rapid recrystallization promotes the formation of a coarse-grained structure, which improves the non-grain-oriented magnetic material properties of the electrical steel sheet. The hot rolling of the strip material can comprise a finishing pass and optionally at least one preliminary pass, which takes place before the finishing pass. The number of necessary preliminary stitches can be determined on the basis of the total degree of rolling to be achieved.

The final stitch can take place at a starting temperature of the strip material between 950 ° C. and 1300 ° C., in particular at a starting temperature of the strip material greater than 1100 ° C. For this purpose, the temperature of the strip material can be kept above 950 ° C., in particular above 1000 ° C., between the casting of the strip material and the final pass. In addition, the temperature of the strip material between the casting of the strip material and the hot rolling can be kept above 950.degree. C., in particular above 1000.degree. The drop in temperature due to the contact of the strip material with the work rolls of the rolling stand should not be taken into account here. Maintaining the temperature above the threshold values mentioned can be achieved in particular by intermediate heating of the strip material between the individual (partial) process steps of strip casting, pre-stitching and finishing stitch.

The aforementioned temperatures relate to the surface temperature of the strip material.

With hot rolling, the final pass can be made with a degree of deformation below the critical deformation degree. In particular, the change in dimensions or geometry of the strip material generated in the course of rolling is referred to as the degree of deformation. The critical degree of deformation is in particular the degree of deformation that is theoretically necessary to enable subsequent recrystallization. The degree of deformation selected under the critical degree of deformation can be, for example, up to 10%. Through the design of the final pass below the critical degree of deformation, the number of crystallization nuclei is kept low. In particular, the combination of hot rolling of the strip material at starting temperatures of the strip material greater than 950 ° C and degrees of deformation below the critical degree of deformation promotes a microstructure with coarse grains, which improves the non-grain-oriented magnetic material properties of the electrical steel sheet.

The hot-rolled and reeled strip material can be cooled to form the non-grain-oriented electrical steel strip in a cooling arrangement into which the reeled strip material is inserted. A heating hood or a passive insulating hood, for example, can be used as a cooling arrangement. The specific design of the cooling process depends on various technical framework conditions, such as the dimensions (thickness, width) of the strip material or coil, the cooling arrangement used and its size. Correspondingly, the cooling process in the cooling arrangement can be adjusted as required, in particular in such a way that a grain size of preferably 80 to 100 micrometers is produced in the strip material. The hot-rolled and coiled strip material can be kept at a temperature above 900 ° C. for at least two minutes by the cooling arrangement after it has been inserted into it. This in turn favors a microstructure with a coarse grain, which improves the non-grain-oriented magnetic material properties of the electrical steel sheet. As an alternative or in addition, the reeled strip material can be kept at a temperature above 850 ° C. for at least three minutes and / or up to four minutes after being inserted into the cooling arrangement.

The final cooling of the hot-rolled and reeled strip material to form the non-grain-oriented electrical steel strip can take place immediately after reeling, that is to say in particular without a time delay.

The object is also achieved by a device for producing a non-grain-oriented strip material, in particular according to one of the methods described above, comprising: a strip casting arrangement for the continuous casting of a strip material; a finishing mill for finish hot rolling the strip material; a reel arrangement for winding the hot-rolled strip material into a coil, and a cooling arrangement for finally cooling the hot-rolled and coiled strip material into the non-grain-oriented electrical strip.

The advantages of the method described above can be transferred analogously to the proposed device, so that at this point, to avoid repetition, reference is made to the above explanation of the method described above. The features of the method can be applied to the device and vice versa.

For pre-rolling the strip material, also called pre-pass, the device can have at least one pre-rolling stand which is arranged in front of the finishing stand. In addition, the device can have a heating arrangement which the strip material in an area between the strip casting arrangement and the reel arrangement and / or in an area between the strip casting arrangement and the finishing rolling stand and / or in an area between the strip casting arrangement and the at least one roughing stand and / or can heat in an area between the at least one roughing stand and the finishing stand.

• 1 eine Prozessabfolge eines erfindungsgemäßen Verfahrens zur Herstellung von nicht-kornorientiertem Elektroband und dessen Weiterverarbeitung zu Elektroblechplatinen; und
• 2 schematisch eine erfindungsgemäße Vorrichtung zur Herstellung von nicht-kornorientiertem Elektroband und dessen Weiterverarbeitung zu Elektroblechplatinen.

In addition, the device can have a contouring arrangement to which the electrical steel can be fed and which can cut electrical sheet metal blanks from the strip material. The contouring arrangement can be arranged immediately after the cooling arrangement. Alternatively, it is possible that immediately after the cooling arrangement, a skin-pass arrangement for skin-pass treatment of the strip material follows, the contouring arrangement immediately following the skin-pass arrangement. In particular, the device has no arrangement between the cooling arrangement and the contouring arrangement for the cold rolling of the strip material. In addition, the device between the cooling arrangement and the contouring arrangement in particular also has no arrangement for heating the strip material, in particular for heating the strip material to temperatures above 300.degree. A possible embodiment of the method according to the invention and a possible embodiment of the device according to the invention are explained below with reference to the figures. It shows

• 1 a process sequence of a method according to the invention for the production of non-grain-oriented electrical steel and its further processing into electrical steel blanks; and
• 2 schematically, a device according to the invention for the production of non-grain-oriented electrical steel and its further processing into electrical steel blanks.

This in 1 The method illustrated by means of a flow chart and the in 2 illustrated device 1 for the production of non-grain-oriented electrical steel 25th and its further processing into electrical sheet metal sheets 26th are described together below.

The device 1 for the production of a non-grain-oriented electrical steel 25th includes a tape casting assembly 2 with which a tape material 6th by means of a continuous strip casting process from a melt 5 is poured. The tape casting assembly 2 is designed in the present case according to the vertical two-roll process, in which the strip material 6th from a casting gap created by a first casting roller 4th and a second casting roll 4 ' is formed, emerges in the vertical direction. However, it is also possible for the strip casting arrangement to be designed according to any alternative strip casting method, in particular according to a horizontal strip casting method. In a first process step V10 is via a distributor 3 the melt 5 in one between the two casting rollers 4th , 4 ' formed melt pool 5 ' introduced and in a subsequent process step V20 with rotation of the casting rollers 4th , 4 ' into the shape of the tape material 6th poured. This is where the tape material 6th with a casting thickness of a maximum of 2.5 mm, in particular of a maximum of 1.5 mm, measured directly behind the casting gap.

The melt used in the present case is a steel melt which has a carbon mass fraction between 0.001% and 0.06%, at least one of the elements silicon with a mass fraction of less than 7.5% and aluminum with a mass fraction of less than 4%, optionally a Alloy additive up to a total of 2.135 mass percent, as well as iron and unavoidable impurities as the remainder. In particular, it is also conceivable that the melt has silicon with a mass fraction of 2.0% to 7.5% and / or aluminum with a mass fraction of 0.1% to 4%. The optional alloy addition can include at least one of the elements manganese with a maximum proportion of 1.5%, phosphorus with a maximum proportion of 0.1%, tin with a maximum proportion of 0.2%, antimony with a maximum proportion of 0.2%, titanium a maximum proportion of 0.01%, niobium with a maximum proportion of 0.05%, vanadium with a maximum proportion of 0.05%, nitrogen with a maximum proportion of 0.015%, and boron with a maximum proportion of 0.01%, with each other the stated mass fractions relate to the melt.

In a further process step V23, the strip material 6th fed to a hot rolling process. This is where the tape material 6th guided in such a way that the temperature of the strip material 6th is kept above 950 ° C, in particular above 1000 ° C. In the present embodiment, the device comprises 1 for this purpose a heating unit 7th between the tape caster assembly 2 and a roughing stand 8th is arranged. Alternatively, it is also possible that the stretch that the strip material 6th between the tape caster assembly 2 and the roughing mill 8th covered, depending on the ambient temperature and the speed of the strip material 6th is chosen so short that a drop in the temperature of the strip material 6th below 950 ° C or 1000 ° C is excluded.

In the present embodiment, the hot rolling process comprises two rolling steps, a preliminary pass V30 and a finishing pass V40. The V30 preliminary pass is optional and can be included in the hot rolling process depending on the overall degree of rolling to be achieved. Alternatively, it is also conceivable that more than one preliminary pass takes place in the hot rolling process. The tape material 6th becomes a roughing stand for the V30 preliminary pass 8th with a starting temperature of the strip material 6th at a temperature greater than 950 ° C. The roughing mill 8th includes two work rolls 10 , 10 ' , which together form a roll gap through which the strip material 6th is passed through, wherein a pre-rolled strip material 6 ' is produced. The work rolls 10 , 10 ' can each in a known manner on one or more backup rollers 9 , 9 ' prop up. The tape material 6th is determined by the run-in thickness of the strip material through the pre-stitch V30 6th to an outlet thickness of the pre-rolled strip material 6 ' rolled. The resulting degree of rolling in the preliminary pass V30 can be selected, for example, as a function of the total degree of rolling of the hot rolling process. The degree of rolling in the preliminary pass V30 can in particular be selected so that the critical degree of deformation is not exceeded.

After the pre-cut V30, the pre-rolled strip material becomes 6 ' transferred to the finishing stitch V40 in a process step V34. The pre-rolled strip material 6 ' be guided in such a way that the temperature of the pre-rolled strip material 6 ' above 950 ° C, in particular above 1000 ° C, is kept. In the present embodiment, the device 1 for this purpose a heating unit 11 on that between the roughing mill 8th and a finishing stand 12th is arranged. Alternatively, it is also conceivable that the route that the pre-rolled strip material 6 ' between the roughing stand 8th and the finishing stand 12th covered, for example depending on the ambient temperature and the speed of the pre-rolled strip material 6 ' is chosen so short that a drop in the temperature of the pre-rolled strip material 6 ' has not occurred below 950 ° C or 1000 ° C.

The pre-rolled strip material 6 ' becomes the finishing mill stand with the finishing pass V40 12th with a starting temperature of the pre-rolled strip material 6 ' between 950 ° C and 1300 ° C supplied. The finishing stand 12th includes two work rolls 14th , 14 ' , which together form a roll gap through which the pre-rolled strip material 6 ' is passed through, wherein a finish-rolled strip material 6 " is produced. The work rolls 14th , 14 ' are each supported in a known manner on one or more support rollers 13th , 13 ' from. The pre-rolled strip material 6 ' is determined by the finishing pass V40 from an inlet thickness of the pre-rolled strip material 6 ' to an outlet thickness of the finish-rolled strip material 6 " rolled. The resulting degree of rolling in the final pass V40 is selected so that the degree of rolling to be achieved in the hot rolling process is achieved. The degree of rolling in the final pass V40 can in particular be selected so that the critical degree of deformation is not exceeded. The finishing pass V40 becomes a thickness of the hot-rolled strip material 6 " of less than 0.8 mm.

After the finishing pass V40, the finished rolled strip material becomes 6 " in a process step V45 of a reel arrangement 16 fed, in which the finish-rolled strip material 6 " in process step V50 to form a coil 17th is reeled up. The finished rolled strip material is thereby 6 " such between the finishing stand 12th and the reel assembly 16 led that the temperature of the finish-rolled strip material 6 " above 900 ° C, in particular above 1000 ° C, is kept. In the present embodiment, the device 1 for this purpose a heating unit 15th on that between the finishing stand 12th and the reel assembly 16 is arranged. Alternatively, it is also possible that the route that the finish-rolled strip material 6 " between the finishing stand 12th and the reel assembly 16 covered, for example depending on the ambient temperature and the speed of the finish-rolled strip material 6 " is chosen so short that a drop in the temperature of the finish-rolled strip material 6 " does not take place below 900 ° C or 1000 ° C.

The warming unit 15th forms together with the two other heating units 7th and 11 a heating arrangement, wherein on one or more of the heating units 7th , 11 and 15th can also be dispensed with. As an alternative, it is furthermore also possible that a device for producing a non-grain-oriented strip material comprises a heating arrangement which consists of a heating unit which is located, for example, between the strip casting arrangement 2 and the reel assembly 16 or between the tape casting assembly 2 and the finishing stand 12th extends.

Between the final pass V40 of the hot rolling process and the reeling V50 of the finished rolled strip material 6 " there is therefore no further deformation of the finish-rolled strip material 6 " , in particular no further cold forming of the finish-rolled strip material 6 " , another reheating of the finish-rolled strip material 6 " to temperatures below 900 ° C after a previous cooling to room temperature. In other words, the reel-up V50 of the finish-rolled strip material takes place 6 " immediately after the finishing pass V40 of the hot rolling process.

The rewinding V50 of the finished rolled strip material 6 " to a coil 17th takes place at a winding temperature of greater than 900 ° C, in particular greater than 1000 ° C. The reel assembly 16 is thereby of a cooling arrangement 18th with which the cooling V60 of the hot-rolled and reeled strip material 6 ''' can be controlled so that the desired non-grain oriented magnetic and mechanical properties of the electrical steel 25th after the hot-rolled and reeled strip material has cooled 6 ''' be achieved.

The parameters to be selected for cooling depend in particular on the thickness and width of the strip material. According to one possible procedure, the hot-rolled and reeled strip material can be cooled 6 ''' to the non-grain oriented electrical steel 25th under the cooling arrangement 18th take place in such a way that the reeled strip material 6 ''' is held above a temperature of 900 ° for at least two minutes. This allows grain sizes in the non-grain-oriented electrical steel 25th from 80 to 100 µm can be achieved.

The cooling of the V60 can be carried out completely at the location of the reel assembly 16 respectively. Alternatively, a completely wound coil 17th together with the cooling arrangement 18th from the location of the reel assembly 16 be moved away to a storage location in order to complete the cooling that has started there. This allows the reel assembly 16 can be released again promptly for further strip material using the device 1 to create.

After the coil has completely cooled down 17th to the non-grain-oriented electrical steel 25th can the coil 17th in a process step V67 of a further reel arrangement 19th are fed to the non-grain-oriented electrical steel 25th to electrical sheet metal sheets 26th further processing. The electrical steel 25th is thereby in a process step V70 through the reel arrangement 19th from the coil 17th unwound and in the present embodiment of the device in an optional process step V78 of a skin pass arrangement 20th fed. The electrical steel 25th is in a process step V80 between two skin pass rollers 21 , 21 ' trained. In a process step V89, the trained electrical steel is 25 ' a contouring arrangement 22nd who have favourited a stamp 23 and a die 24 includes, supplied. In a process step V90 is converted from the trained electrical steel 25 ' in a known way by stamp 23 and die 24 an electrical sheet metal board 26th separated out. Alternatively, the contouring arrangement can also be carried out using further cutting processes, for example laser cutting. In addition, it is also possible, in particular, for a plurality of electrical strips or strips of electrical strips to be guided one above the other and through the contouring arrangement 22nd Electrical sheet metal packs are separated from these in a separating step.

List of reference symbols

1

contraption

2

Strip casting assembly

3

Distributor

4, 4 '

Casting roller

5, 5 '

melt

6, 6 ', 6' ', 6' ''

Tape material

7th

Heating unit

8th

Roughing mill

9, 9 '

Backup roll

10, 10 '

Work roll

11

Heating unit

12th

Finishing stand

13, 13 '

Backup roll

14, 14 '

Work roll

15th

Heating unit

16

Reel arrangement

17th

Coil

18th

Cooling arrangement

19th

Reel arrangement

20th

Skin pass arrangement

21, 21 '

Skin pass rollers

22nd

Contouring arrangement

23

stamp

24

die

25, 25 '

Electrical steel

26th

Electrical sheet metal board

V.

Process step

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• WO 2018/019602 A1 [0003]
• US 5102478 A [0004]

Claims (15)

A method for producing a non-grain oriented electrical steel, comprising the steps: Casting (V20) a strip material (6) from a melt (5) by means of a continuous strip casting process; Hot rolling (V30, V40) of the strip material (6) at starting temperatures of the strip material (6) greater than 950 ° C., a hot-rolled strip material (6 ") with a thickness of less than 0.8 mm being produced; Coiling (V50) the hot-rolled strip material (6 ″) into a coil (17), the winding taking place at a winding temperature of the hot-rolled strip material (6 ″) greater than 900 ° C, in particular greater than 1000 ° C; and Cooling (V60) of the hot-rolled and reeled strip material (6 '' ') to form the non-grain-oriented electrical strip (25). Procedure according to Claim 1 , characterized in that the melt (5) is a steel melt which comprises the following alloying elements in percent by mass: $$0.001\%<\text{C.}\le 0.06\%,$$

at least one of the elements Si <7.5% and Al <4%, optionally an alloy additive with at least one alloy element from the group of Mn, P, Sn, sb, Ti, Nb, V, N and B with a total of ≤ 2.135% as well as the balance iron and inevitably impurity. Procedure according to Claim 2 , characterized in that in the melt (5) the proportion of Si in percent by mass is 2.0% to 7.5%, and / or that in the melt (5) the proportion of Al in percent by mass 0.1% to 4 % is. Method according to one of the Claims 2 or 3 , characterized in that the alloy additive is at least one of $$\begin{array}{l}\text{Mn}\le 1.5\%,\\ \text{P.}\le 0.1\%,\\ \text{Sn}\le 0.2\%,\\ \text{Sb}\le 0.2\%,\\ \text{Ti}\le 0.01\%,\\ \text{Nb}\le 0.05\%,\\ \text{V}\le 0.05\%,\\ \text{N}\le 0.015\%,\text{and}\\ \text{B.}\le 0.01\%\end{array}$$

has, in each case in percent by mass. Method according to one of the Claims 1 to 4th , characterized in that during casting (V20) through the continuous strip casting process, the strip material (6) is cast with a casting thickness of a maximum of 2.5 mm, in particular of a maximum of 1.5 mm. Method according to one of the Claims 1 to 5 , characterized by maintaining the temperature (V23) of the strip material (6) above 950 ° C, in particular above 1000 ° C, between the casting (V20) of the strip material (6) and the hot rolling (V30, V40). Method according to one of the Claims 1 to 6th , characterized in that the hot rolling (V30, V40) of the strip material (6) comprises a finishing pass (V40) and optionally at least one preliminary pass (V30) which takes place before the finishing pass (V40) and produces a pre-rolled band material (6 ') . Procedure according to Claim 7 , characterized in that the finishing stitch (V40) takes place at a start temperature of the strip material (6, 6 ') between 950 ° C and 1300 ° C, in particular at a start temperature of the strip material (6, 6') greater than 1100 ° C. Method according to one of the Claims 7 or 8th , characterized by holding or intermediate heating of the temperature (V23, V34) of the strip material (6, 6 ') between the casting (V20) of the strip material (6) and the final stitch (V40) above 950 ° C, in particular above 1000 ° C. Method according to one of the Claims 7 to 9 , characterized in that the final pass (V40) takes place with a degree of deformation below the critical degree of deformation. Method according to one of the Claims 1 to 10 , characterized in that the cooling (V60) of the hot-rolled and coiled strip material (6 ''') to the non-grain-oriented electrical strip (25) takes place under a cooling arrangement (18), the hot-rolled and coiled strip material (6''') is kept at a temperature above 900 ° C. in particular for at least two minutes by the cooling arrangement (18). Method according to one of the Claims 1 to 11 , characterized in that the cooling (V60) of the hot-rolled and reeled strip material (6 ''') to the non-grain-oriented electrical strip (25) takes place immediately after the coiling (V50). Apparatus for producing a non-grain-oriented strip material, in particular according to the method according to one of the Claims 1 to 12th , full a strip casting arrangement (2) for continuously casting (V20) a strip material (6); a finishing stand (12) for finish hot rolling (V40) the strip material (6); a reel arrangement (16) for reeling (V50) the hot-rolled strip material (6 ") into a coil (17), and a cooling arrangement (18) for cooling (V60) the hot-rolled and reeled-up strip material (6"') to the non- grain-oriented electrical steel (25). Device according to Claim 13 , characterized by at least one roughing stand (8), which is arranged in front of the finishing stand (12), for roughing (V30) the strip material (6). Device according to one of the Claims 13 or 14th , characterized by a heating arrangement (7, 11, 15) which the strip material at least in one of the areas between the strip casting arrangement (2) and the reel arrangement (16), between the strip casting arrangement (2) and the finishing stand (12) between the strip casting arrangement (2) and the at least one roughing stand (8), and between the at least one roughing stand (8) and the finishing stand (12).

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